Re: [sqlalchemy] How to create model with dynamically set schema?
sector119 sector...@gmail.com wrote:
Hello!
I have some model:
class Person(Base):
__tablename__ = 'person'
id = Column(BigInteger, primary_key=True, autoincrement=False)
locality_id = Column(Integer, ForeignKey(SYSTEM_SCHEMA + '.locality.id'),
nullable=False)
street_id = Column(Integer, ForeignKey('street.id'), nullable=False)
building = Column(Integer, nullable=False)
apartment = Column(Integer, nullable=False)
...
I want to create this model at different schemas: 'schema1', 'schema2',
'schema3' and model's FK street_id should point to 'street.id' at the same
schema!
How can I do that?
this is an ongoing area for people, as there’s different ways to do so-called
“multi-tenancy” vs. “sharding” etc. So it sort of depends on what you
actually need. Let’s assume you need the different Person classes
simultaneously, e.g. more of a sharding situation.
Easiest way is to make a mixin, there’s an example at
https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/EntityName, second
one down.
Mixins have gotten a lot better, so you should be able to do what you need.
There’s even more fixes for mixins in 1.0 that is nearing beta releases.
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Re: [sqlalchemy] How to create model with dynamically set schema?
sector119 sector...@gmail.com wrote: Michael, I want to set search_path to locality schema that depends on user settings. that’s more like multi-tenancy. much easier, you don’t have to bother creating multiple models. And I have some kind of admin utility where user can setup locality environment (schema) with set of tables and I have the list of models those should be created at some schema that admin-user would specify.. How can I create those list of Models at some table? We’d like to add a “schema” feature to “execution options”, such that an individual set of DB operations can proceed by adding some “schema” to all tables or a subset of tables, but that’s a future feature. In PG, we have search_path. So you should just set up search_path as you need before you perform some operation. Such as, you want to emit a create_all: with engine.connect() as conn: conn.execute(“set search_path = ….”) Base.metadata.create_all(conn) that’s all you need at that level, unless things are more complicated (like, you need to create tables in multiple schemas of variable names…for that I’d use an execution event that rewrites schema names). -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
Re: [sqlalchemy] How to create model with dynamically set schema?
Michael, I want to set search_path to locality schema that depends on user settings. And I have some kind of admin utility where user can setup locality environment (schema) with set of tables and I have the list of models those should be created at some schema that admin-user would specify.. How can I create those list of Models at some table? -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
